The Art and Science of Beautiful Skin.
Most people have moles that are raised bumps. Atypical moles are different from the garden variety mole. They are often flat, larger than a pencil eraser, have a non-round, irregular shape and may contain more than one color, including tans, browns, reds and pinks.
Atypical moles can be a precursor to melanoma and should be monitored for change. The chance for flat moles turning into cancer increases for people with four or more atypical moles, melanoma or a close relative with melanoma.
See our article: What to Look for When Evaluating Skin Moles
For more information, visit the American Academy of Dermatology at www.aad.org/skin-conditions